.loader {
    position: relative;
    width: 12.5em;
    height: 12.5em;
    transform: rotate(165deg);
}

.loader:before,
.loader:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    display: block;
    width: 2.5em;
    height: 2.5em;
    border-radius: 1.25em;
    transform: translate(-50%, -50%);
}

.loader:before {
    animation: before 2s infinite;
}

.loader:after {
    animation: after 2s infinite;
}

@keyframes before {
    0% {
        width: 2.5em;
        box-shadow: 5em -2.5em rgba(88, 163, 243, 0.75), -5em 2.5em rgba(153, 202, 255, 0.75);
    }

    35% {
        width: 12.5em;
        box-shadow: 0 -2.5em rgba(88, 163, 243, 0.75), 0 2.5em rgba(153, 202, 255, 0.75);
    }

    70% {
        width: 2.5em;
        box-shadow: -5em -2.5em rgba(88, 163, 243, 0.75), 5em 2.5em rgba(153, 202, 255, 0.75);
    }

    100% {
        box-shadow: 5em -2.5em rgba(88, 163, 243, 0.75), -5em 2.5em rgba(153, 202, 255, 0.75);
    }
}

@keyframes after {
    0% {
        height: 2.5em;
        box-shadow: 2.5em 5em rgba(224, 224, 224, 0.75), -2.5em -5em rgba(198, 200, 210, 0.75);
    }

    35% {
        height: 12.5em;
        box-shadow: 2.5em 0 rgba(224, 224, 224, 0.75), -2.5em 0 rgba(198, 200, 210, 0.75);
    }

    70% {
        height: 2.5em;
        box-shadow: 2.5em -5em rgba(224, 224, 224, 0.75), -2.5em 5em rgba(198, 200, 210, 0.75);
    }

    100% {
        box-shadow: 2.5em 5em rgba(224, 224, 224, 0.75), -2.5em -5em rgba(198, 200, 210, 0.75);
    }
}

/** * Attempt to center the whole thing! */
html,
body {
    height: 100%;
}

.loader {
    position: absolute;
    top: calc(50% - 6.25em);
    left: calc(50% - 6.25em);
}